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Table 2 Difference (95% CI) in blood pressure by categories of BMI and Hb levels in first trimester

From: Interaction of body mass index and hemoglobin concentration on blood pressure among pregnant women in Guangxi, China

  Non-high BMI (<26.8 kg/m2) High BMI (≥26.8 kg/m2)
  Hb <13.0 g/dL Hb ≥13.0 g/dL Hb <13.0 g/dL Hb ≥13.0 g/dL
Number 2218 907 213 134
SBP (mmHg)a 109.7 111.7 112.4 113.3
Model 1b 0.0 (reference) 2.6 (0.9, 4.2) 3.0 (0.5, 5.5) 4.0 (2.1, 6.0)
Model 2c 0.0 (reference) 2.5 (0.8, 4.2) 2.9 (0.5, 5.3) 3.8 (1.7, 5.4)
Model 3d 0.0 (reference) 1.4 (-0.3, 3.1) 2.6 (0.3, 4.9) 2.9 (0.8, 5.0)
DBP (mmHg)a 67.5 69.0 70.0 72.4
Model 1b 0.0 (reference) 1.9 (-0.3, 4.2) 3.2 (0.6, 5.7) 5.1 (2.7, 7.6)
Model 2c 0.0 (reference) 1.9 (-0.2, 4.1) 3.2 (0.8, 5.6) 5.0 (2.7, 7.4)
Model 3d 0.0 (reference) 1.0 (-1.0, 3.0) 2.5 (0.1, 4.9) 3.9 (1.5, 6.3)
  1. CI, confidence interval; SBP, systolic blood pressure; DBP, diastolic blood pressure; Hb, Hemoglobin.
  2. aMean SBP; mean DBP.
  3. bModel 1: Adjusted for age (continuous) and ethnicity (Han, Zhuang, other).
  4. cModel 2: Further adjusted for education (<12 years, ≥12 years), family income < US$ 3000 (yes, no), urban residence (yes, no), parity (0, 1, >1), and folic acid supplement (yes, no).
  5. dModel 3: Further adjusted for total cholesterol (continuous), triglycerides (continuous), and diabetes mellitus (yes, no).